**1. The angle in a semi circle is 90°**

**2. Angles in the same segment are equal**

**3. Angle at the centre is twice the angle on the circumference**

**4. A tangent meets a radius at 90°**

**5. Two tangents to a circle from the same point are equal**

**6. Opposite angles of a cyclic quadrilateral* add up to 180°**

**7. The perpendicular bisector of any chord goes through the centre of a circle**

**8. Alternate segment theorm - the angle between a tangent and a chord to the angle in the opposite segement**

*cyclic quadrilateral means all 4 vertices are on the circumference

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